By the end of the century, baseball had become so popular that production had spread well beyond the Americas and into the Pacific Isles By the turn of the century, most baseball cards were produced by confectionery companies and tobacco companies. The 1952 Topps Mickey Mantle is considered to be the most valuable post-war sportscard. It's the King of post-war baseball cards and a powerful image familiar to all collectors. However there are still few original cards in circulation. Cards that have been inspected by a third party grading company are known as graded baseball cards. The babe brought people back into the stands and revolutionized the game. Visiting baseball card and sports memorabilia shows is also a great way to find cards. If you are a sports fan of any game, you must have heard one of this names mentioned at any one time. Picking and choosing the perfect card is the fun part.